In the high-stakes environment of a pediatric emergency department, the protocol for a 12-year-old presenting with classic signs of appendicitis is well-established. When a patient arrives wincing with right lower quadrant pain, the clinical team swiftly secures vitals, orders blood work, and performs a bedside ultrasound. The findings are textbook: uncomplicated appendicitis. The standard of care dictates admission and scheduling for surgery the following morning.
Yet, in modern American medicine, clinical protocols are often secondary to a more pervasive, invisible force. When the boy’s anxious parents request a confirmatory abdominal CT scan, the medical team—despite knowing the diagnosis is clear and the scan will provide no actionable new information—orders it anyway. The family will receive a bill for several thousand dollars, and the clinical plan will remain unchanged. This scenario, witnessed routinely by medical students on clerkship rotations, highlights a fundamental tension in contemporary healthcare: the chasm between evidence-based medicine and "defensive medicine."
The Duality of Practice: Medicine for Two Audiences
As medical students at the Icahn School of Medicine at Mount Sinai, we have come to realize that medicine is effectively practiced for two distinct audiences. The first is the patient sitting on the exam table. The second is the hypothetical lawyer who, in the event of a negative outcome, will mercilessly depose the physician.
This is the essence of defensive medicine. It is the practice of ordering diagnostic tests, procedures, or consultations—or avoiding high-risk, necessary treatments—not because they benefit the patient’s health, but because they protect the provider from potential litigation. It is a phenomenon that has evolved from a sporadic reaction to a systemic "hidden curriculum" that shapes the behavior of every physician from the first day of residency.
A Historical Perspective: The Legacy of the 1970s
Defensive medicine is not a modern invention; it is a ghost of the 1970s malpractice crisis. That decade saw a seismic shift in the legal landscape, characterized by skyrocketing malpractice claims, massive jury awards, and a subsequent explosion in medical liability insurance premiums. As the financial risk of practicing medicine climbed, the cultural response was immediate. Physicians, feeling the heat of potential professional and financial ruin, began to prioritize the avoidance of error—specifically, the failure to diagnose—above the principles of cost-effective, high-value care.
Today, this legacy persists. Research published in JAMA Internal Medicine in 2014 underscored the scale of this behavior, revealing that 28% of all hospital orders and 13% of total costs within a large medical center were, at least in part, defensive.
The Two Syllabi: Evidence vs. Liability
For medical students, the educational experience is marked by a jarring dissonance. In the early morning, we study evidence-based management algorithms published by prestigious medical societies. These guides emphasize diagnostic parsimony, the minimization of radiation exposure, and the importance of clinical judgment.
However, during daily clinical rounds, a second, unwritten syllabus takes shape. We observe emergency medicine physicians ordering "positive" defensive imaging to cover all bases. We see cardiac surgeons opting for palliative care for patients who technically qualify for surgery but whose perioperative risk scores are high enough to invite scrutiny should an outcome be poor—an example of "negative" defensive medicine.
The consequences of missing a rare diagnosis are often catastrophic, both for the patient and the physician’s career. In contrast, the consequence of ordering one "extra" test is usually minimal to the provider. This asymmetric risk profile drives a wedge between what we memorize in our textbooks and what we practice at the bedside.
The Psychology of "Anticipated Regret"
To dismiss defensive medicine as "bad faith" is to ignore the human condition. Behavioral economists identify this phenomenon as "anticipated regret"—the psychological impulse to avoid the emotional burden of wishing, in hindsight, that one had ordered "just one more test."
When an emergency physician orders an unnecessary CT scan, they are often performing an act of self-preservation. It is a rational response to an irrational, hyper-litigious environment. The physician is not failing to be a doctor; they are effectively managing their own survival in a system that punishes the "missed" diagnosis far more severely than it rewards the prudent use of resources.
The Cost of the Extra Test: Implications for Patients and Systems
While many argue that an extra scan is a "harmless" safety net, the reality is far more complex. The clinical, financial, and systemic impacts of defensive medicine are profound.
Clinical Harms
For the patient, the "extra" test is rarely benign. Each unnecessary CT scan exposes a patient to excess ionizing radiation, increasing lifetime cancer risk. Furthermore, the practice leads to a cascade of incidentalomas—clinically irrelevant findings that trigger a cycle of further testing, anxiety, and potentially invasive procedures that carry their own risks.
Systemic and Financial Burdens
The financial toll is equally significant. Hospitals, already operating on razor-thin margins due to Medicaid cuts and rising labor costs, face increased operational strain. Defensive medicine slows down emergency department workflows, keeps beds occupied longer than necessary, and contributes to the unsustainable trajectory of national healthcare spending. When a hospital system is forced to provide lower-value care, the patient experience suffers, with longer wait times and higher out-of-pocket costs becoming the norm.
Institutional Responses: The Role of High-Value Care
Hospitals have begun to recognize that they must act to curb this trend. Many institutions have established "High-Value Care" committees aimed at standardizing evidence-based protocols and curbing wasteful spending.
Having served in leadership roles within such committees and as management consultants, we have witnessed the potential for success. Stewardship of IV antibiotics, for example, has significantly limited the development of multidrug-resistant infections. Proactive discharge planning has reduced unnecessary hospital stays, thereby decreasing the incidence of hospital-acquired infections and delirium.
However, these committees face a fundamental hurdle: asymmetry of incentives. A hospital can implement electronic health record (EHR) prompts to discourage low-value testing, but the organization does not bear the personal, professional, or emotional risk that the individual clinician faces when they decide not to order that test. Until the legal and financial liability structures are aligned with clinical outcomes, hospital-level interventions will remain only partially effective.
Toward a New Medical Culture
Defensive medicine is not merely a bureaucratic nuisance; it is a pervasive, defining feature of the American medical experience. It influences how we teach, how we learn, and ultimately, how we care for patients. As students, we struggle to discern when a senior clinician’s choice is rooted in sound medical evidence and when it is a defensive maneuver to satisfy the "hypothetical lawyer."
Solving this problem will not happen through a single policy change or a new insurance model. It requires a fundamental shift in medical culture. We must begin by bringing these conversations out of the "hidden curriculum" and into the light of formal medical education.
By integrating discussions about the realities of liability, risk perception, and the economics of care into our early training, we can better prepare future physicians to navigate these pressures. We may not be able to eliminate the legal risks that physicians face, but we can provide the next generation with the tools to critically evaluate when to adhere to evidence-based practice and when the defensive instinct—however human—might be doing more harm than good.
The goal is not to ignore the legal realities of our profession, but to ensure that the patient’s health, rather than the clinician’s fear, remains the primary driver of medical decision-making. Through honest dialogue and structural reform, we can hope to reconcile the two syllabi that currently divide the modern physician’s mind.
